Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92425083eac77b2…

MALICIOUS

PDF

86.3 KB Created: 2021-09-04 03:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd8cfb38fac616e419dcbe2bbd8897aa SHA-1: 718337b610be34130dfa7ecbdc69867e4b365ea6 SHA-256: d92425083eac77b2f87936a4743ce621f91aacbadeebfb87573761939e8218c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.pzkexie.com/up_files/file/joxiridupaselivunir.pdf In PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/31cb790b5f28a8998c3fbc6d6ea5cc6e/42744005424.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/mupoduweki.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/butolisenolup.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/71979752214.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/sviautknk0b52jdvv5d2hblesa/76114332207.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608743cb75d20---66659189694.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609702218fc37---vewedesazolivumip.pdfIn PDF document text
    • http://schokobrunnen.com/idata/roledesuduzixepudizi.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f9b4d36ed2f223b3056686c748b2ab9d/53034375585.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161113ed92a8fc---6486915491.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/busakulevarugiwo.pdfIn PDF document text
    • https://mmszke.hu/files/file/bawoxozegata.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/budowobogirunotivapadadu.pdfIn PDF document text
    • http://iwort.de/userfiles/file/62818481100.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210528154350.pdfIn PDF document text
    • https://agatanorek.com/files/file/rifulil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098350e0ff26---kusulifagaze.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/981eb105b6bf2ed23190ab2ba07d27b3/wisukenifatalezitu.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/13002895725.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/83215469482.pdfIn PDF document text
    • http://firegallery.ru/img/upload/70156406006.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/patokaraninelut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=derrick+jensen+endgame+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 21312 bytes
SHA-256: a7aa4f618219e0ef47a07fca6afa7dbe58f1cacd3ac45888fa8f0862108d90ec
font_01_sfnt_off00011937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11937 10920 bytes
SHA-256: ff88af1cd265a59dfd968f3b78077ef05e25b9fd768ba0c9af93ccacbef23c97
font_02_sfnt_off0001323e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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